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Aliakbar Akbarzadeh - One of the best experts on this subject based on the ideXlab platform.
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investigating the potential for using a simple water Reaction Turbine for power production from low head hydro resources
Energy Conversion and Management, 2013Co-Authors: Abhijit Date, Ashwin Date, Aliakbar AkbarzadehAbstract:Abstract In this analysis the simple Reaction water Turbine known as Barker’s Mill is revisited. The major geometrical and operational parameters have been identified and, using principles of conservation of mass, momentum and energy, the governing equations have been developed for the ideal case of there being no frictional losses. The solutions of the resulting equations are offered in a non-dimensional form. It is shown that the maximum torque produced by the machine is developed when the Turbine is stationary. At this point the net output power is zero. As the load torque is decreased the Turbine rotates and power is produced. Furthermore, because of a centrifugal pumping effect, the mass flow rate of water through the Turbine increases during acceleration. Further decrease in the load torque is accompanied by increases of speed, output power, water mass flow rate and efficiency. It is shown that when the load torque is reduced towards half the value of the torque at the stationary condition, water mass flow rate, rotational speed and output power tend towards infinity. Under this condition the efficiency of the machine approaches unity. The non-dimensional characteristics of the idealized Turbine are used to investigate the general characteristics of the machine and to explore its application for production of power from water reservoirs with low heads. Theoretical analysis of a simple Reaction Turbine is presented including consideration of the fluid frictional losses for a practical situation. A practical Turbine will never run away towards infinite speed and the maximum power and efficiency of such a Turbine will depend on the fluid frictional losses. Here a new factor is defined, representing the overall fluid frictional losses within the Turbine. Finally this paper presents briefly the experimental performance results for two simple Reaction water Turbine prototypes. The two Turbine prototypes under investigation have rotor diameters O0.24 m and O0.12 m respectively. The two Turbine models were tested under supply heads ranging from 1 m to 4 m. The simple Reaction water Turbine can operate under very low hydro-static head with high energy conversion efficiency. This type of Turbine exhibits prominent self-pumping ability at high rotational speeds. Under low head to achieve high rotational speeds the Turbine diameter should be very small and this limits the volumetric capacity and hence the power generation capacity of such a Turbine. Consequently the practical applications of this Turbine would be limited to micro-hydro power generation. The split pipe design of the Reaction Turbine tested is easy to manufacture and it has been shown to have overall energy conversion efficiency of approximately 50% even under low heads.
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expander modelling in binary cycle utilizing geothermal resources for generating green energy in victoria australia
Procedia Engineering, 2012Co-Authors: M Oreijah, As Date, M Bryson, Abhijit Date, Aliakbar AkbarzadehAbstract:Abstract This paper investigates the computational modeling of a binary organic Rankine power cycle. The computer model has been generated to aid the design and manufacture of apparatus that will be utilized during experimentation on the geothermal resources in Victoria, Australia. A review of Australia's geothermal prospects is also presented here. Suitable technology to utilize the low grade heat from the available geo-fluids has been explained to connect the recent technology with the new approached design. The paper involves the design of the heat engine with the Reaction Turbine. In addition, theoretical analysis and performance predictions have been presented briefly in the paper to compare between different diameters for the Reaction Turbine in the organic Rankine cycle engine with power and efficiency. In this paper, realistic recommendations will be discussed to the best of the geothermal energy as sustainable energy resources to be useful for achieving the Australian target.The binary cycle is modeled to evaluate the output power and the efficiency. A computer model for binary cycle is presented in this paper. Thermal-mechanical energy conversion efficiency is predicted using the computer modeling and presented in the analysis.
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Design and analysis of a split Reaction water Turbine
Renewable Energy, 2010Co-Authors: Abhijit Date, Aliakbar AkbarzadehAbstract:This paper explores the performance characteristics of a split Reaction water Turbine. The governing equations are derived by using the principles of conservation of mass, momentum and energy for a practical case, which includes consideration of frictional losses. The optimum diameter for a simple Reaction Turbine is defined and an equation for the optimum diameter is derived. Design and building procedures for a split Reaction Turbine are described. Using the equation for optimum diameter and assuming a loss factor (k-factor) of 0.05, optimum rotor diameters for different operating heads and rotational speeds are plotted and discussed. Measured performance of a 122 mm diameter split Reaction water Turbine rotor is presented. The relationship between k-factor and relative velocity for a split Reaction Turbine model is discussed with reference to experimental data.
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combined water desalination and power generation using a salinity gradient solar pond as a renewable energy source
2008Co-Authors: Yuchun Zhao, Aliakbar Akbarzadeh, John AndrewsAbstract:Integrated desalination and electricity generation using solar energy is a prospective way to solve the twin challenges of energy and fresh water shortage, while helping save farm land degradation in salt-affected areas. As part of the design of a combined desalination and power supply system, this paper presents the performance analysis of a two-phase nozzle using a homogenous equilibrium model. It also presents the designing and testing of a prototype system using three different types of nozzle under static and rotary conditions. Initially the performance analysis of a spray nozzle is presented along estimation of both the fresh water production and power generation. The performance analysis of a convergent-divergent (C-D) nozzle is then presented. The experimental results for fresh water production are consistent with the theoretical calculation using the Homogenous Equilibrium Expansion Model (HEM). However, there is a large difference between experimental and theoretical values for power generation. Based on the experimental analysis, reasons for the low power generation are found and a new design for the Reaction Turbine is proposed using a curve length C-D nozzle to overcome the problems encountered with the previous prototype. The preliminary results show a 30% improvement in the experimentally observed Reaction force caused by the flow of water in the static test of the new nozzle design. After analyzing the efficiency of the cycle by T-S diagram and comparing with the experimental results obtained with reference to different pressures and temperatures, it is suggested that an evacuated tube solar collector connected in series with salinity gradient solar ponds can be used to boost the temperature of the salt water and to improve the efficiency of the system..
Abhijit Date - One of the best experts on this subject based on the ideXlab platform.
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investigating the potential for using a simple water Reaction Turbine for power production from low head hydro resources
Energy Conversion and Management, 2013Co-Authors: Abhijit Date, Ashwin Date, Aliakbar AkbarzadehAbstract:Abstract In this analysis the simple Reaction water Turbine known as Barker’s Mill is revisited. The major geometrical and operational parameters have been identified and, using principles of conservation of mass, momentum and energy, the governing equations have been developed for the ideal case of there being no frictional losses. The solutions of the resulting equations are offered in a non-dimensional form. It is shown that the maximum torque produced by the machine is developed when the Turbine is stationary. At this point the net output power is zero. As the load torque is decreased the Turbine rotates and power is produced. Furthermore, because of a centrifugal pumping effect, the mass flow rate of water through the Turbine increases during acceleration. Further decrease in the load torque is accompanied by increases of speed, output power, water mass flow rate and efficiency. It is shown that when the load torque is reduced towards half the value of the torque at the stationary condition, water mass flow rate, rotational speed and output power tend towards infinity. Under this condition the efficiency of the machine approaches unity. The non-dimensional characteristics of the idealized Turbine are used to investigate the general characteristics of the machine and to explore its application for production of power from water reservoirs with low heads. Theoretical analysis of a simple Reaction Turbine is presented including consideration of the fluid frictional losses for a practical situation. A practical Turbine will never run away towards infinite speed and the maximum power and efficiency of such a Turbine will depend on the fluid frictional losses. Here a new factor is defined, representing the overall fluid frictional losses within the Turbine. Finally this paper presents briefly the experimental performance results for two simple Reaction water Turbine prototypes. The two Turbine prototypes under investigation have rotor diameters O0.24 m and O0.12 m respectively. The two Turbine models were tested under supply heads ranging from 1 m to 4 m. The simple Reaction water Turbine can operate under very low hydro-static head with high energy conversion efficiency. This type of Turbine exhibits prominent self-pumping ability at high rotational speeds. Under low head to achieve high rotational speeds the Turbine diameter should be very small and this limits the volumetric capacity and hence the power generation capacity of such a Turbine. Consequently the practical applications of this Turbine would be limited to micro-hydro power generation. The split pipe design of the Reaction Turbine tested is easy to manufacture and it has been shown to have overall energy conversion efficiency of approximately 50% even under low heads.
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expander modelling in binary cycle utilizing geothermal resources for generating green energy in victoria australia
Procedia Engineering, 2012Co-Authors: M Oreijah, As Date, M Bryson, Abhijit Date, Aliakbar AkbarzadehAbstract:Abstract This paper investigates the computational modeling of a binary organic Rankine power cycle. The computer model has been generated to aid the design and manufacture of apparatus that will be utilized during experimentation on the geothermal resources in Victoria, Australia. A review of Australia's geothermal prospects is also presented here. Suitable technology to utilize the low grade heat from the available geo-fluids has been explained to connect the recent technology with the new approached design. The paper involves the design of the heat engine with the Reaction Turbine. In addition, theoretical analysis and performance predictions have been presented briefly in the paper to compare between different diameters for the Reaction Turbine in the organic Rankine cycle engine with power and efficiency. In this paper, realistic recommendations will be discussed to the best of the geothermal energy as sustainable energy resources to be useful for achieving the Australian target.The binary cycle is modeled to evaluate the output power and the efficiency. A computer model for binary cycle is presented in this paper. Thermal-mechanical energy conversion efficiency is predicted using the computer modeling and presented in the analysis.
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Design and analysis of a split Reaction water Turbine
Renewable Energy, 2010Co-Authors: Abhijit Date, Aliakbar AkbarzadehAbstract:This paper explores the performance characteristics of a split Reaction water Turbine. The governing equations are derived by using the principles of conservation of mass, momentum and energy for a practical case, which includes consideration of frictional losses. The optimum diameter for a simple Reaction Turbine is defined and an equation for the optimum diameter is derived. Design and building procedures for a split Reaction Turbine are described. Using the equation for optimum diameter and assuming a loss factor (k-factor) of 0.05, optimum rotor diameters for different operating heads and rotational speeds are plotted and discussed. Measured performance of a 122 mm diameter split Reaction water Turbine rotor is presented. The relationship between k-factor and relative velocity for a split Reaction Turbine model is discussed with reference to experimental data.
Ashwin Date - One of the best experts on this subject based on the ideXlab platform.
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investigating the potential for using a simple water Reaction Turbine for power production from low head hydro resources
Energy Conversion and Management, 2013Co-Authors: Abhijit Date, Ashwin Date, Aliakbar AkbarzadehAbstract:Abstract In this analysis the simple Reaction water Turbine known as Barker’s Mill is revisited. The major geometrical and operational parameters have been identified and, using principles of conservation of mass, momentum and energy, the governing equations have been developed for the ideal case of there being no frictional losses. The solutions of the resulting equations are offered in a non-dimensional form. It is shown that the maximum torque produced by the machine is developed when the Turbine is stationary. At this point the net output power is zero. As the load torque is decreased the Turbine rotates and power is produced. Furthermore, because of a centrifugal pumping effect, the mass flow rate of water through the Turbine increases during acceleration. Further decrease in the load torque is accompanied by increases of speed, output power, water mass flow rate and efficiency. It is shown that when the load torque is reduced towards half the value of the torque at the stationary condition, water mass flow rate, rotational speed and output power tend towards infinity. Under this condition the efficiency of the machine approaches unity. The non-dimensional characteristics of the idealized Turbine are used to investigate the general characteristics of the machine and to explore its application for production of power from water reservoirs with low heads. Theoretical analysis of a simple Reaction Turbine is presented including consideration of the fluid frictional losses for a practical situation. A practical Turbine will never run away towards infinite speed and the maximum power and efficiency of such a Turbine will depend on the fluid frictional losses. Here a new factor is defined, representing the overall fluid frictional losses within the Turbine. Finally this paper presents briefly the experimental performance results for two simple Reaction water Turbine prototypes. The two Turbine prototypes under investigation have rotor diameters O0.24 m and O0.12 m respectively. The two Turbine models were tested under supply heads ranging from 1 m to 4 m. The simple Reaction water Turbine can operate under very low hydro-static head with high energy conversion efficiency. This type of Turbine exhibits prominent self-pumping ability at high rotational speeds. Under low head to achieve high rotational speeds the Turbine diameter should be very small and this limits the volumetric capacity and hence the power generation capacity of such a Turbine. Consequently the practical applications of this Turbine would be limited to micro-hydro power generation. The split pipe design of the Reaction Turbine tested is easy to manufacture and it has been shown to have overall energy conversion efficiency of approximately 50% even under low heads.
Richard Lenhard - One of the best experts on this subject based on the ideXlab platform.
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Experimental Evaluation of Axial Reaction Turbine Stage Bucket Losses
'MDPI AG', 2021Co-Authors: Marek Klimko, Pavel Žitek, Richard Lenhard, Katarína KaduchováAbstract:The article describes the measurement methods and data evaluation from a single-stage axial Turbine with high Reaction (50%). Four operating modes of the Turbine were selected, in which the wake traversing behind nozzle and bucket with five-hole pneumatic probes took place. The article further focuses on the evaluation of bucket losses for all four measured operating modes, including the analysis of measurement uncertainties
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Measurement on Axial Reaction Turbine Stage
'EDP Sciences', 2020Co-Authors: Marek Klimko, Pavel Žitek, Richard LenhardAbstract:This article describes a measuring methods and evaluating measured data on a single-stage axial Turbine with Reaction (~ 50 %). One Turbine operating mode was selected, in which the traversing behind the nozzle and bucket with two 5-hole pneumatic probes took place. The results are distributions of flow angles, Reactions, or losses distribution/efficiencies along the blades
Marek Klimko - One of the best experts on this subject based on the ideXlab platform.
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Experimental Evaluation of Axial Reaction Turbine Stage Bucket Losses
'MDPI AG', 2021Co-Authors: Marek Klimko, Pavel Žitek, Richard Lenhard, Katarína KaduchováAbstract:The article describes the measurement methods and data evaluation from a single-stage axial Turbine with high Reaction (50%). Four operating modes of the Turbine were selected, in which the wake traversing behind nozzle and bucket with five-hole pneumatic probes took place. The article further focuses on the evaluation of bucket losses for all four measured operating modes, including the analysis of measurement uncertainties
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Measurement on Axial Reaction Turbine Stage
'EDP Sciences', 2020Co-Authors: Marek Klimko, Pavel Žitek, Richard LenhardAbstract:This article describes a measuring methods and evaluating measured data on a single-stage axial Turbine with Reaction (~ 50 %). One Turbine operating mode was selected, in which the traversing behind the nozzle and bucket with two 5-hole pneumatic probes took place. The results are distributions of flow angles, Reactions, or losses distribution/efficiencies along the blades
